Know Your Numbers: Why the Most Important Insight in Cardiology Can Be a Single Figure

What does "Know Your Numbers" actually mean?

"Know Your Numbers" isn't a single campaign but a core principle of cardiovascular prevention, established by medical bodies such as the American Heart Association: everyone should know their own key values — blood pressure, cholesterol, blood sugar (or HbA1c), and body weight measured as BMI and waist circumference. The target ranges are set by cardiology and public health bodies based on large-scale evidence — a blood pressure target below 120/80 mmHg, a BMI between 18.5 and 24.9, or a waist circumference under 88 cm for women and 102 cm for men.

Why isn't feeling healthy enough?

High blood pressure, elevated blood lipids, and elevated blood sugar typically cause no noticeable symptoms for years — which is exactly why medicine calls them "silent" risk factors. That's what makes them dangerous: damage to blood vessels, the heart, and the kidneys builds up long before anyone feels sick. WHO explicitly stresses how important early detection of these markers in primary care is for preventing heart attacks, strokes, and heart failure before they happen.

Why do so many people still not know their own numbers?

One of the largest analyses of global blood pressure data to date, covering more than 104 million participants across 1,201 studies, found that in 2019, around 580 million people worldwide with hypertension didn't know they had it — 41% of affected women and 51% of affected men. In most cases, the problem isn't a lack of medical knowledge — it's simply the absence of a measurement at the right moment.

Why this is exactly the thesis we pursue at speak23

That gap — between what's medically measurable and what people actually know about themselves — is where our work starts. We noticed early on: a number by itself changes nothing. Only once someone sees their own value, understands it, and relates it to themselves does an abstract statistic become something personal — and only then does real change begin.

That's what makes "Know Your Numbers" more than a memorable slogan: it's cardiology's own confirmation of a principle that holds for preventive medicine as a whole.

#### In an aging society spending more of its years living with illness than without it, that's one of the more hopeful messages there is: a large part of it isn't fate — it starts simply with knowing, and with the willingness to look.